CN112393478B - Defrosting control method of heat pump air conditioner - Google Patents
Defrosting control method of heat pump air conditioner Download PDFInfo
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- CN112393478B CN112393478B CN202011296949.2A CN202011296949A CN112393478B CN 112393478 B CN112393478 B CN 112393478B CN 202011296949 A CN202011296949 A CN 202011296949A CN 112393478 B CN112393478 B CN 112393478B
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- 238000010257 thawing Methods 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 238000001514 detection method Methods 0.000 abstract description 13
- 239000003570 air Substances 0.000 description 51
- 230000008859 change Effects 0.000 description 6
- 238000004378 air conditioning Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000013524 data verification Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
- F24F11/67—Switching between heating and cooling modes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a defrosting control method of a heat pump air conditioner, wherein the heat pump air conditioner comprises a temperature sensor arranged on a condenser, and the defrosting control method mainly comprises the following steps: setting relevant parameters required in detection in a controller in advance, recording the temperature of a condenser at the moment as a stable temperature value if a compressor runs stably after a heat pump air conditioner enters a heating mode, and realizing frosting detection by judging the sizes of the stable temperature value and a condenser temperature value detected in real time, namely judging whether the heat pump air conditioner needs to enter a defrosting mode or not; the end of the defrosting mode is realized by judging the real-time temperature value of the condenser after entering the defrosting mode and the defrosting end temperature; according to the defrosting control method of the heat pump air conditioner, provided by the invention, the frosting and defrosting detection can be realized by adopting 1 coil temperature sensor, the frosting detection is realized by comparing the temperature value of the condenser detected in real time in the heating mode with the stable temperature value, the judgment is accurate, and the reliability is high.
Description
Technical Field
The invention relates to the technical field of heat pump air conditioners, in particular to a defrosting control method of a heat pump air conditioner.
Background
The heat pump air conditioner is a device for transferring the heat of a low-level heat source to a high-level heat source, comprises a compressor, a condenser, an evaporator, a throttle valve and other parts, and has the working principle consistent with that of a common compression refrigeration air conditioner; the heat pump air conditioner can change an indoor evaporator into a condenser and change an outdoor condenser into an evaporator by changing the working state of the four-way reversing valve, thereby realizing the switching of the refrigeration and heating functions; the heat pump is the preferred device for heating because the heating energy efficiency of the heat pump is 4 to 6 times that of electric heating.
When the conventional heat pump air conditioner is switched to a heating mode in winter, the initial temperature of the coil is low, and if the temperature of the coil is lower than the dew point temperature of outdoor air, the surface of the outdoor coil is frosted; the outdoor coil pipe is seriously frosted, the frost layer can increase the heat transfer resistance of the heat exchanger, reduce the air flow rate, increase the power consumption of a fan and weaken the heating capacity of a system, thereby causing the abnormal operation of the system; an effective defrost control strategy is therefore needed to ameliorate the above problems.
In the existing heat pump air conditioner product, the problems of inaccurate frosting detection, unreliable detection and easy error defrosting or frequent defrosting are caused, the heating efficiency of the heat pump is reduced, and the use experience of customers is influenced.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a defrosting control method of a heat pump air conditioner, which adopts 1 coil temperature sensor to realize frosting and defrosting detection, realizes frosting detection by comparing the temperature value of a condenser detected in real time in a heating mode with the temperature value of the condenser after a compressor runs stably, and has an accurate and reliable judgment scheme.
In order to achieve the purpose, the invention adopts the following technical scheme:
a defrosting control method of a heat pump air conditioner comprises a compressor, a fan, a throttling element, a condenser, an evaporator, a four-way valve and a controller, and further comprises a coil temperature sensor arranged on the condenser, and the defrosting control method comprises the following steps:
s100, setting temperature steady-state time A1, a defrosting period A2, a defrosting temperature difference T4, a forced defrosting temperature T5, a defrosting ending temperature T6 and defrosting maximum operation time A3 in the controller in advance;
s200, the heat pump air conditioner enters a heating mode, the controller controls the four-way valve to be attracted and the compressor and the fan to be started, the controller records the running time A4 of the compressor and records the time A5 of the heating mode of the heat pump air conditioner, if A4 is not more than A1, the controller controls the heat pump air conditioner to stop heating, and if A4 is more than A1, the step S300 is executed;
s300, when the coil temperature sensor reaches the temperature steady-state time A1, sending the steady temperature value T1 of the condenser to the controller, comparing the values of A5 and A2 by the controller, and if A5 is larger than A2, executing the step S400;
s400, the controller receives a real-time temperature value T2 detected by the coil temperature sensor, and compares the sizes of T2-T1 and T3, if T2-T1 is not more than T3, step S500 is executed, and if T2-T1 is more than T3, step S600 is executed;
s500, maintaining a heating mode of the heat pump air conditioner;
s600, the heat pump air conditioner enters a defrosting mode, and the controller controls the four-way valve to be disconnected and the compressor and the fan to be started; the controller receives a real-time temperature value T3 in the defrosting mode detected by the coil temperature sensor, exits the defrosting mode if T3 is greater than T6, and executes step S700 if T3 is less than or equal to T6;
and S700, maintaining the defrosting mode of the heat pump air conditioner.
In the defrosting control method of the heat pump air conditioner, the coil temperature sensor is arranged at a position where the condenser is most likely to frost or at a position where the condenser is least likely to defrost.
In the defrosting control method of the heat pump air conditioner, a step S410 is further included between the step S400 and the step S500, and the step S410 specifically includes:
s410, if T2-T1 is not less than T3 in the step S400, further judging the sizes of T2 and T5, if T2 is more than T5, executing the step S600, and if T2 is not more than T5, executing the step S500.
In the defrosting control method of the heat pump air conditioner, a step S420 is further included between the step S410 and the step S500, and the step S420 specifically includes:
s420, if T2 is not greater than T5 in step S410, further comparing a5 with 2 × a2, if a5 > 2 × a2, performing step S600, and if a5 is not greater than 2 × a2, performing step S500.
In the defrosting control method of the heat pump air conditioner, a step S610 is further included between the step S600 and the step S700, and the step S610 specifically includes:
and S610, after the heat pump air conditioner enters a defrosting mode, the controller records the running time A6 of the defrosting mode in real time, if the T3 is not more than T6 in the step S600, the sizes of A6 and A3 are further compared, if the A6 is more than A3, the defrosting mode is exited, and otherwise, the step S700 is executed.
The invention also correspondingly provides a heat pump air conditioner which comprises a controller, and a compressor, a fan, a throttling element, a condenser, an evaporator and a four-way valve which are respectively electrically connected with the controller, wherein the controller can execute the defrosting control method of the heat pump air conditioner.
Has the advantages that:
the invention provides a defrosting control method of a heat pump air conditioner, which has the following advantages:
(1) the frosting and defrosting detection is realized by adopting 1 coil temperature sensor, the detection is convenient and accurate, and the overall structure of the heat pump air-conditioning system is simplified;
(2) the frosting detection is realized by comparing the temperature value of the condenser detected in real time in the heating mode with the stable temperature value of the condenser at the stable operation moment of the compressor, and the judgment method has high accuracy and reliability;
(3) whether the defrosting mode is entered or not comprises 3 judging conditions, and whether the defrosting mode is ended or not comprises 2 judging conditions, so that the judging accuracy and reliability of the defrosting control method are improved, the problems of wrong defrosting, early defrosting, abnormal defrosting mode quitting and the like are avoided, and the energy-saving effect of the heat pump air conditioner is improved.
Drawings
FIG. 1 is a control flow chart of a defrost control method provided by the present invention;
FIG. 2 is a control flowchart of step S400, step S410 and step S420 provided by the present invention;
FIG. 3 is a control flow chart of step S600 and step S610 provided by the present invention
FIG. 4 is a diagram illustrating the operation of the system in the heating mode according to the present invention;
fig. 5 is a diagram illustrating the operation of the system in the defrost mode provided by the present invention.
Description of the main element symbols: 1-fan, 2-evaporator, 3-four-way valve, 4-compressor, 5-throttling element, 6-outdoor side, 61-condenser and 62-coil temperature sensor.
Detailed Description
The invention provides a defrosting control method of a heat pump air conditioner, and in order to make the purpose, technical scheme and effect of the invention clearer and clearer, the invention is further described in detail below by referring to the attached drawings and embodiments.
In the description of the present invention, it is to be understood that the terms "mounted," "connected," and the like are to be interpreted broadly, and those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations.
Referring to fig. 1 to 5, the present invention provides a defrosting control method for a heat pump air conditioner, the heat pump air conditioner includes a compressor 4, a fan 1, a throttling element 5, a condenser 61, an evaporator 2, a four-way valve 3, and a controller (not shown), and the heat pump air conditioner further includes a coil temperature sensor 62 disposed on the condenser 61.
Referring to fig. 4, when the heat pump air conditioner is in a heating mode, the four-way valve 3 is closed, the heat exchanger on the outdoor side 6 is the evaporator 2, the heat exchanger on the indoor side is the condenser 61, after the compressor 4 is started, moisture in ambient air can be gradually frozen on the surface of the evaporator 2 due to the low evaporation temperature of the evaporator 2, and after a frost layer is accumulated to a certain thickness, the evaporator 2 can cause the low-pressure to be lower than the allowable value of the heat pump air conditioning system due to insufficient heat exchange, and at this time, the heat pump air conditioner needs to enter a defrosting mode.
Referring to fig. 5, when the heat pump air conditioner is in the defrosting mode, the four-way valve 3 is turned off, the heat exchanger on the outdoor side 6 is the condenser 61, the heat exchanger on the indoor side is the evaporator 2, and after the compressor 4 is started, the evaporator 2 absorbs ambient heat on the indoor side and releases heat on the condenser 61 to melt a frost layer, thereby defrosting the heat exchanger.
Referring to fig. 1 to 3, the defrosting control method includes the following steps:
s100, setting temperature steady-state time A1, a defrosting period A2, a defrosting temperature difference T4, a forced defrosting temperature T5, a defrosting ending temperature T6 and defrosting maximum operation time A3 in the controller in advance; in the present embodiment, the temperature steady-state time a1 is set to 8 minutes, and the defrost cycle a2 is set to 45 minutes; the defrosting temperature difference T4 is that in the heating mode, because the surface of the heat exchanger gradually frosts, there is a temperature difference between the actual heating temperature and the predetermined heating temperature, and the temperature difference gradually increases, and the increase and change size and the increase and change speed of the defrosting temperature difference are related to the ambient temperature, the air moisture content, the air volume, and the evaporation temperature of the heat exchanger, in this embodiment, the defrosting temperature difference is the temperature difference value when frosting is most serious in the experimental test; the forced defrosting temperature T5 may be set by a user according to an operation environment of the heat pump air conditioner; the defrosting ending temperature T6 can be taken as a preset value in experimental detection, and the average temperature value of the condenser 61 is a preset value when defrosting is ended; the defrosting maximum operation time a3 may be set by a user according to an operation environment of the heat pump air conditioner.
S200, the heat pump air conditioner enters a heating mode, the controller controls the four-way valve 3 to be sucked and the compressor 4 and the fan 1 to be started, the controller records the running time A4 of the compressor 4 and the time A5 of the heat pump air conditioner running heating mode, if A4 is not more than A1, the controller controls the heat pump air conditioner to stop heating, and if A4 is more than A1, the step S300 is executed.
S300, when the coil temperature sensor 62 reaches the temperature steady-state time A1, the stable temperature value T1 of the condenser 61 is sent to the controller, the controller compares the sizes of A5 and A2, and if A5 is larger than A2, the step S400 is executed.
S400, the controller receives a real-time temperature value T2 detected by the coil temperature sensor 62, and compares the values of T2-T1 and T3, namely, the value of the temperature increment is judged, so that whether the frosting thickness is larger than an allowable threshold value is judged, if the T2-T1 is not larger than T3, the step S500 is executed, and if the T2-T1 is larger than T3, the step S600 is executed; the stable temperature value T1 of condenser 61 that records when compressor 4 operates steadily is as the initial value, and the real-time temperature value T2 of condenser 61 that coil pipe temperature sensor 62 detected in real time is the change value, and the difference between change value and the initial value is the temperature variation, and when the temperature variation is greater than the threshold value that allows, heat pump air conditioning system enters the defrosting mode, passes through experimental test data verification, adopts this judgement condition to carry out the judgement whether to enter the defrosting mode, and accuracy and reliability are high.
And S500, maintaining the heating mode of the heat pump air conditioner.
S600, the heat pump air conditioner enters a defrosting mode, and the controller controls the four-way valve 3 to be disconnected and the compressor 4 and the fan 1 to be started; the controller receives a real-time temperature value T3 in the defrosting mode detected by the coil temperature sensor 62, exits the defrosting mode if T3 is greater than T6, and executes step S700 if T3 is less than or equal to T6; after the frost layer accumulated on the heat exchanger gradually melts, the pressure value and the temperature value of the heat pump air-conditioning system are both slowly increased, and the defrosting ending temperature is used as a judging condition for judging whether to end defrosting through judgment of a large amount of measured data, so that the heat pump air-conditioning system can be ensured to accurately finish a defrosting task.
And S700, maintaining the defrosting mode of the heat pump air conditioner.
Further, the coil temperature sensor 62 is disposed at a position where the condenser 61 is most likely to frost or at a position where the condenser 61 is least likely to defrost; and the position which is easiest to frost or the position which is least easy to frost is obtained through experimental detection according to the working environment of the heat pump air conditioner.
Further, referring to fig. 2, a step S410 is further included between step S400 and step S500, where step S410 specifically is:
s410, if T2-T1 is not less than T3 in the step S400, further judging the sizes of T2 and T5, if T2 is more than T5, executing the step S600, and if T2 is not more than T5, executing the step S500.
Further, referring to fig. 2, a step S420 is further included between step S410 and step S500, where step S420 specifically is:
s420, if T2 is not greater than T5 in step S410, further comparing a5 with 2 × a2, if a5 > 2 × a2, performing step S600, and if a5 is not greater than 2 × a2, performing step S500.
In this embodiment, whether the defrosting mode is to be entered or not can be achieved by judging whether the defrosting temperature difference detected in real time is greater than the set defrosting temperature difference or by judging whether the temperature detected in real time is greater than the forced defrosting temperature or by judging whether the heating time is greater than twice of the defrosting period, that is, the judging conditions for judging whether the defrosting mode needs to be entered or not include 3 conditions, and if any one of the conditions is triggered, the heat pump air conditioner enters the defrosting mode, so that the accuracy and reliability of judgment by the defrosting control method are improved, the problems of mistaken defrosting and premature defrosting are avoided, and the energy-saving effect of the heat pump air conditioner is improved.
Further, referring to fig. 3, a step S610 is further included between step S600 and step S700, where step S610 specifically is:
and S610, after the heat pump air conditioner enters the defrosting mode, the controller records the running time A6 of the defrosting mode in real time, if the T3 in the step S600 is not more than T6, the sizes of A6 and A3 are further compared, if A6 is more than A3, the defrosting mode is exited, and otherwise, the step S700 is executed.
In this embodiment, whether the defrosting mode exits or not can be detected by judging whether the temperature value detected in real time is greater than the defrosting ending temperature or judging whether the defrosting operation time is greater than the maximum defrosting operation time, that is, whether the judgment condition for judging whether the defrosting mode needs to exit or not includes 2, and if any condition is triggered, the heat pump air conditioner exits the defrosting mode, so that the accuracy and reliability of judgment performed by the defrosting control method are improved, and the abnormality occurring when the defrosting mode exits is avoided.
Referring to fig. 4 and 5, the present invention further provides a heat pump air conditioner, which includes a controller, and a compressor, a fan, a throttling element, a condenser, an evaporator, and a four-way valve electrically connected to the controller, wherein the controller is capable of executing the defrosting control method of the heat pump air conditioner.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the protective scope of the present invention.
Claims (6)
1. A defrosting control method of a heat pump air conditioner comprises a compressor, a fan, a throttling element, a condenser, an evaporator, a four-way valve and a controller, and is characterized in that the heat pump air conditioner also comprises a coil temperature sensor arranged on the condenser, and the defrosting control method comprises the following steps:
s100, setting temperature steady-state time A1, a defrosting period A2, a defrosting temperature difference T4, a forced defrosting temperature T5, a defrosting ending temperature T6 and defrosting maximum operation time A3 in the controller in advance;
s200, the heat pump air conditioner enters a heating mode, the controller controls the four-way valve to be attracted and the compressor and the fan to be started, the controller records the running time A4 of the compressor and records the time A5 of the heating mode of the heat pump air conditioner, if A4 is not more than A1, the controller controls the heat pump air conditioner to stop heating, and if A4 is more than A1, the step S300 is executed;
s300, when the coil temperature sensor reaches the temperature steady-state time A1, sending the steady temperature value T1 of the condenser to the controller, comparing the values of A5 and A2 by the controller, and if A5 is larger than A2, executing the step S400;
s400, the controller receives a real-time temperature value T2 detected by the coil temperature sensor, compares the sizes of T2-T1 and T3, if T2-T1 is not more than T3, the step S500 is executed, and if T2-T1 is more than T3, the step S600 is executed;
s500, maintaining a heating mode of the heat pump air conditioner;
s600, the heat pump air conditioner enters a defrosting mode, and the controller controls the four-way valve to be disconnected and the compressor and the fan to be started; the controller receives a real-time temperature value T3 in the defrosting mode detected by the coil temperature sensor, exits the defrosting mode if T3 is greater than T6, and executes step S700 if T3 is less than or equal to T6;
and S700, maintaining the defrosting mode of the heat pump air conditioner.
2. The defrosting control method of a heat pump air conditioner according to claim 1, wherein the coil temperature sensor is disposed at a position where the condenser is most likely to frost or at a position where the condenser is least likely to defrost.
3. The defrosting control method of a heat pump air conditioner according to claim 1, further comprising a step S410 between the step S400 and the step S500, wherein the step S410 is specifically: s410, if T2-T1 is not less than T3 in the step S400, further judging the sizes of T2 and T5, if T2 is more than T5, executing the step S600, and if T2 is not more than T5, executing the step S500.
4. The defrosting control method of a heat pump air conditioner according to claim 3, further comprising a step S420 between the step S410 and the step S500, wherein the step S420 specifically is: s420, if T2 is not greater than T5 in step S410, further comparing a5 with 2 × a2, if a5 > 2 × a2, performing step S600, and if a5 is not greater than 2 × a2, performing step S500.
5. The defrosting control method of a heat pump air conditioner according to claim 1, further comprising a step S610 between the step S600 and the step S700, wherein the step S610 specifically is: and S610, after the heat pump air conditioner enters the defrosting mode, the controller records the running time A6 of the defrosting mode in real time, if the T3 in the step S600 is not more than T6, the sizes of A6 and A3 are further compared, if A6 is more than A3, the defrosting mode is exited, and otherwise, the step S700 is executed.
6. A heat pump air conditioner comprising a controller and a compressor, a fan, a throttling element, a condenser, an evaporator and a four-way valve electrically connected to the controller, respectively, wherein the controller is capable of performing the defrosting control method of the heat pump air conditioner as set forth in any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011296949.2A CN112393478B (en) | 2020-11-18 | 2020-11-18 | Defrosting control method of heat pump air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011296949.2A CN112393478B (en) | 2020-11-18 | 2020-11-18 | Defrosting control method of heat pump air conditioner |
Publications (2)
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| CN115654777B (en) * | 2022-11-09 | 2023-12-15 | 南京天加环境科技有限公司 | Defrosting control method and device and heat pump unit |
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| CN104728989A (en) * | 2013-12-18 | 2015-06-24 | 珠海格力电器股份有限公司 | Defrosting control method of air conditioner and air conditioner carrying out defrosting control method |
| CN104807132A (en) * | 2014-01-23 | 2015-07-29 | 珠海格力电器股份有限公司 | Defrosting control method and device |
| CN105157290A (en) * | 2014-05-26 | 2015-12-16 | 广东美的制冷设备有限公司 | Air conditioner and defrosting control method thereof |
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| US10018400B2 (en) * | 2013-08-13 | 2018-07-10 | Lennox Industries Inc. | Defrost operation management in heat pumps |
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| CN104728989A (en) * | 2013-12-18 | 2015-06-24 | 珠海格力电器股份有限公司 | Defrosting control method of air conditioner and air conditioner carrying out defrosting control method |
| CN104807132A (en) * | 2014-01-23 | 2015-07-29 | 珠海格力电器股份有限公司 | Defrosting control method and device |
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